SIBERIAN JOURNAL OF PHYSICS最新文献_第5页

Investigation of the Possibility of Using Turn-by-Turn Measurements to Detect Perturbations in the Magnetic Structure of Accelerators 利用逐转测量检测加速器磁结构扰动的可能性研究

SIBERIAN JOURNAL OF PHYSICS Pub Date : 2024-02-21 DOI: 10.25205/2541-9447-2023-18-3-5-19

D. V. Dorokhova, V. Dorokhov, S. A. Nikitin

{"title":"Investigation of the Possibility of Using Turn-by-Turn Measurements to Detect Perturbations in the Magnetic Structure of Accelerators","authors":"D. V. Dorokhova, V. Dorokhov, S. A. Nikitin","doi":"10.25205/2541-9447-2023-18-3-5-19","DOIUrl":"https://doi.org/10.25205/2541-9447-2023-18-3-5-19","url":null,"abstract":"The PCA correction method consists of a global analysis of turn-by-turn data obtained from beam position monitors (BPMs). One of its main advantages is speed of operation and the ability to detect pulsating power supplies. Along with this, a wide range of applications characterizes the PCA method: determination of perturbations of the accelerator magnetic structure, calculation of transport matrix elements and optical functions, and determination of the magnitude of the transverse coupling. A software prototype implementing the proposed correction method was written and tested on the electron-positron collider VEPP-4M for experimental validation. In the experiments, perturbations were introduced one by one into individual elements of the skew-quadrupole and quadrupole corrections. In one case, the excitation of betatron oscillations was carried out by the kick of the inflector. In another case, the oscillations were excited by resonant swing with a depolariser. It was found that, despite the simplicity of practical implementation, the examined method has some nuances that make it difficult to obtain and identify correct results. Nevertheless, it was possible to identify the introduced perturbations of quadrupole and skew-quadrupole corrections. Moreover, it was possible to detect a magnet with low-frequency pulsations by characteristic changes in the estimated invariants. In addition, the possibility of determining the integral coupling parameters in experiments on the observation of resonantly excited eigen modes having the shape of ellipses in the plane transverse to the beam motion axis is considered.","PeriodicalId":509351,"journal":{"name":"SIBERIAN JOURNAL OF PHYSICS","volume":"231 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140443295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Neutron Beam Shaping Assembly for Boron Neutron Capture Therapy of Superficial Tumors 用于表层肿瘤硼中子俘获疗法的中子束整形组件

SIBERIAN JOURNAL OF PHYSICS Pub Date : 2024-02-21 DOI: 10.25205/2541-9447-2023-18-3-31-42

Т. V. Sycheva, Е. А. Berendeev, G. Verkhovod, S. Taskaev

{"title":"A Neutron Beam Shaping Assembly for Boron Neutron Capture Therapy of Superficial Tumors","authors":"Т. V. Sycheva, Е. А. Berendeev, G. Verkhovod, S. Taskaev","doi":"10.25205/2541-9447-2023-18-3-31-42","DOIUrl":"https://doi.org/10.25205/2541-9447-2023-18-3-31-42","url":null,"abstract":"The Vacuum Insulated Tandem accelerator have been developed in Budker Institute of Nuclear Physics. Neutrons are generated in 7Li(p,n)7Be reaction. Neutron beam shaping assembly is used for therapeutic beam forming. It consists of the moderator, reflector and filter. Magnesium fluoride is considered optimal material for neutron slowing down because of noticeable cross section of inelastic neutron scattering. Previously, we showed that it is optimal to use proton beam at energy 2.3 MeV for neutron generation.As a result of a critical analysis of our earlier decisions on the methods used to form a therapeutic neutron beam and decisions of other research groups, as well as successful experiments on the irradiation of laboratory pets and cell cultures carried out at our experimental facility, we noticed that with the recent trend towards a decrease in proton energy the process of inelastic scattering in MgF2 is no longer decisive in neutron moderation, and it was decided to consider materials based on plexiglass as a moderator material.In this work we considered Poly-Biz as moderator material and get the neutron beam the same quality as with MgF2 moderator and proton energy 2.3 MeV but at lower proton energy and current that can cause treatment time reducing and allows more reliable neutron generation.For a long time, the development of BNСT was hindered by the lack of charged particle accelerators that provide stable production of a stationary 2.5 MeV 10 mA proton beam. The use of BSA with Poly-Biz allows the use of these accelerators at lower energy, which improves the reliability of their operation, and reduces the therapy time by more than 2 times, which is also important for therapy. Also, the use of such an BSA simplifies the requirements for a charged particle accelerator and this opens up both the possibility of optimizing the developed accelerators and the use of other accelerators that have not yet reached the required parameters.","PeriodicalId":509351,"journal":{"name":"SIBERIAN JOURNAL OF PHYSICS","volume":"64 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140444359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dipole Magnets with a Homogeneous Field of the SKIF 具有 SKIF 均相磁场的偶极磁体

SIBERIAN JOURNAL OF PHYSICS Pub Date : 2024-02-21 DOI: 10.25205/2541-9447-2023-18-3-20-30

К. К. Riabchenko, А. А. Starostenko

引用次数: 0

Thermophysical Properties of Chalcogenide Semiconductor Compounds and the Effect of Defects on Their Properties 钙化半导体化合物的热物理特性及缺陷对其特性的影响

SIBERIAN JOURNAL OF PHYSICS Pub Date : 2023-12-10 DOI: 10.25205/2541-9447-2023-18-2-76-82

G. A. Mustafaev, D. G. Mustafaeva, M. Mustafaev

引用次数: 0

The Study of the Electrical Properties of Anisotropic Semiconductors in the Laboratory Workshop of the University Course in Physics 在大学物理课程实验讲习班上研究各向异性半导体的电学特性

SIBERIAN JOURNAL OF PHYSICS Pub Date : 2023-12-10 DOI: 10.25205/2541-9447-2023-18-2-105-117

V. V. Filippov, A. A. Zavorotny, M. Y. Smirnov, V. Ziyautdinov, D. D. Lykov

{"title":"The Study of the Electrical Properties of Anisotropic Semiconductors in the Laboratory Workshop of the University Course in Physics","authors":"V. V. Filippov, A. A. Zavorotny, M. Y. Smirnov, V. Ziyautdinov, D. D. Lykov","doi":"10.25205/2541-9447-2023-18-2-105-117","DOIUrl":"https://doi.org/10.25205/2541-9447-2023-18-2-105-117","url":null,"abstract":"The purpose of the article is to develop a theoretically and experimentally substantiated specific laboratory work for studying the anisotropy of the electrical properties of semiconductors within the framework of the curricula of higher educational institutions, for such areas of training as “Physics”, “Technical Physics”, “Radiophysics” and “Electronics and Nanoelectronics”. The relevance of the problem is due to the desire of domestic electronics for technological sovereignty and high requirements for the training of qualified personnel for the production of structures of solid-state functional electronics. Based on the solution of the boundary electrodynamic problem, an expression is obtained for the electric potential in the region of a thin rectangular semiconductor sample with a tensor character of conductivity. The results of this work is the development of an original laboratory setup for the demonstration and practical study of the anisotropy of the electrical properties of semiconductor crystals. The proposed technique makes it possible to determine the main electrokinetic parameters of an anisotropic semiconductor – specific conductivity, concentration and Hall mobility of the main charge carriers. A schematic diagram of the installation and formulas for calculating the errors of the measured quantities are proposed. The results obtained may also be of scientific interest in the study of anisotropic semiconductor materials in laboratory conditions.","PeriodicalId":509351,"journal":{"name":"SIBERIAN JOURNAL OF PHYSICS","volume":"4 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139184365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Department of Applied Physics of the Faculty of Physics 物理学院应用物理系

SIBERIAN JOURNAL OF PHYSICS Pub Date : 2023-12-10 DOI: 10.25205/2541-9447-2023-18-2-83-104

A. Zarvin, E. N. Galashov, B. Ezdin, N. Korobeishchikov, P. G. Pasko, A. S. Yaskin

引用次数: 0

Energy Extraction System for the Superconductive Solenoid with Current 5100 A and Stored Energy 22 MJ 电流 5100 安培、储能 22 兆焦耳的超导电磁线圈能量提取系统

SIBERIAN JOURNAL OF PHYSICS Pub Date : 2023-12-09 DOI: 10.25205/2541-9447-2023-18-2-26-35

A. I. Erokhin, A. Kremnev, E. Pyata, V. Shkaruba, A. V. Bulatov, T. V. Bedareva

{"title":"Energy Extraction System for the Superconductive Solenoid with Current 5100 A and Stored Energy 22 MJ","authors":"A. I. Erokhin, A. Kremnev, E. Pyata, V. Shkaruba, A. V. Bulatov, T. V. Bedareva","doi":"10.25205/2541-9447-2023-18-2-26-35","DOIUrl":"https://doi.org/10.25205/2541-9447-2023-18-2-26-35","url":null,"abstract":"At the FAIR (Facility for Antiproton and Ion Research, Darmstadt, Germany) accelerator complex under construction, one of the key experiments is the PANDA experiment. The main field of the PANDA spectrometer is provided by a superconducting solenoid. The energy of the magnetic field stored in a superconducting solenoid reaches 22 MJ at an operating current of 5100 A. In the case of the transition of the superconducting cable used for the solenoid winding into a resistive state, the safe extraction of stored energy is required to protect the magnet. The energy extraction system proposed by the authors provides energy dissipation inside the external dump resistor, and not in the section of the superconducting cable that has passed into resistive state, while preventing its damage. The most critical elements of the energy extraction system are the current breaker, with the help of which the dump resistor is introduced into the power circuit of the superconducting solenoid, and the dump resistor itself. A modernized three-phase circuit breaker was chosen as current breaker. A unique design of the energy extraction system including dump resistor with a low parasitic inductance has been developed.","PeriodicalId":509351,"journal":{"name":"SIBERIAN JOURNAL OF PHYSICS","volume":"23 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139184711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental Study of the Interaction of Controlled Disturbances from Two Sources in the Supersonic Boundary Layer of a Swept Wing 后掠翼超音速边界层中两个来源的可控扰动相互作用的实验研究

SIBERIAN JOURNAL OF PHYSICS Pub Date : 2023-12-09 DOI: 10.25205/2541-9447-2023-18-2-46-53

G. Kolosov, A. D. Kosinov, N. Semionov, A. Yatskikh

引用次数: 0

Development and Testing of a High-Frequency Driver for a Charge-Exchange Source of Negative Hydrogen Ions 开发和测试用于负氢离子电荷交换源的高频驱动器

SIBERIAN JOURNAL OF PHYSICS Pub Date : 2023-12-09 DOI: 10.25205/2541-9447-2023-18-2-36-45

К. I. Anikeeva, V. A. Vointsev, D. Y. Gavrisenko, O. Sotnikov, R. A. Finashin, I. Shikhovtsev

引用次数: 0

Investigation of Composites Based on MWCNTs and Si as an Anode Material in Lithium-ion Batteries 基于 MWCNTs 和硅的复合材料作为锂离子电池负极材料的研究

SIBERIAN JOURNAL OF PHYSICS Pub Date : 2023-12-09 DOI: 10.25205/2541-9447-2023-18-2-66-75

A. Zavorin, S. Moseenkov, S. Stolyarova, A. V. Okotrub, V. L. Kuznetsov

引用次数: 0